In the diagram, we need to identify two segments that are marked as parallel to each other. Parallel segments are often marked with the same number of arrows or other distinct markers.

• The segment $QN$ is marked with a set of double arrows.
• The segment $LM$ is also marked with the same set of double arrows.

Therefore, $QN$ is parallel to $LM$.

The answer is: $\boxed{QN \parallel LM}$

Would you like further details on this solution? Here are some related questions for practice:

1. What other pairs of parallel lines can you find in a different geometric diagram?
2. How do we prove two lines are parallel using the properties of triangles?
3. How does marking affect the identification of parallel lines in diagrams?
4. What are some theorems that use parallel lines to find angles in geometry?
5. How do parallel lines affect the areas of certain geometric shapes?

Tip: In diagrams, always look for repeated patterns of markings (such as arrows or line patterns) to quickly identify parallelism or congruency!